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From: Joerg on 21 Sep 2009 20:14
TMI wrote:
> On Sep 19, 11:41 pm, isw <i...(a)witzend.com> wrote:
>> In article <h8qu9s$bu...(a)news.eternal-september.org>,
>>
>> "N_Cook" <dive...(a)tcp.co.uk> wrote:
>>> I decided to break into my 1000V DC, 10 Gigohm insulation tester, today. No
>>> particular reason , just curious, as still in perfect working order.
>>> Had to break a seal to get inside, never needed repair by me or previous
>>> owners, just my adapting to 9V nicad use rather than pair of unobtainable
>>> 4.5V batteries.
>>> Made in Austria , Norma Isolationmesser 667 001
>>> Date inside is 15 December 1965, i thought it would be 1970s
>>> Just disintegrated foam inside, compenentry like Siemens AD130, AC153 and
>>> OC75 all fine. Whenever I check calibration with a 1G glass cased resistor
>>> it is the same cal setting, no switch problems or anything else.
>> I have a perfectly functioning Simpson 260; the date written inside the
>> meter is 1951; it sports hand-wrapped wirewound resistors in the range
>> switching circuitry. Still nicely calibrated, too, according to my
>> digital meter.
>>
>> I found the meter, in pieces, in a trashcan at RCA Broadcast in the late
>> '60's when I was working there-- somebody had dropped it on the concrete
>> floor. I took it home and repaired the case and other cracks with epoxy.
>>
>> Isaac
>
> Where were you when I bought 40 BC-100 modules!
>
> Well I have a General Radio Type 1432J Decade Resistor at arms length.
> Also a Tektronix 570 tube tracer, Hickok 539c tube tester, Weston 733
> tube tester....I'm sure I have something older....than me! I might add
> this stuff rocks! They can try and peel it from my cold dead fingers.
>

We've got one of these and it's a lot older than I am:

http://www.electricstuff.co.uk/3nfset.jpg

By the way, this was probably the world's first successful attempt at
building an integrated circuit, in the mid 20's. The tube has multiple
sections in there along with caps and resistors. So other than the
resonant circuit, the speaker and the batteries you didn't need anything
else to build a radio:

http://www.electricstuff.co.uk/3nfcct.gif

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
From: N_Cook on 22 Sep 2009 03:25
Joerg <invalid(a)invalid.invalid> wrote in message
news:7hqj7pF2ue5boU1(a)mid.individual.net...
> TMI wrote:
> > On Sep 19, 11:41 pm, isw <i...(a)witzend.com> wrote:
> >> In article <h8qu9s$bu...(a)news.eternal-september.org>,
> >>
> >> "N_Cook" <dive...(a)tcp.co.uk> wrote:
> >>> I decided to break into my 1000V DC, 10 Gigohm insulation tester,
today. No
> >>> particular reason , just curious, as still in perfect working order.
> >>> Had to break a seal to get inside, never needed repair by me or
previous
> >>> owners, just my adapting to 9V nicad use rather than pair of
unobtainable
> >>> 4.5V batteries.
> >>> Made in Austria , Norma Isolationmesser 667 001
> >>> Date inside is 15 December 1965, i thought it would be 1970s
> >>> Just disintegrated foam inside, compenentry like Siemens AD130, AC153
and
> >>> OC75 all fine. Whenever I check calibration with a 1G glass cased
resistor
> >>> it is the same cal setting, no switch problems or anything else.
> >> I have a perfectly functioning Simpson 260; the date written inside the
> >> meter is 1951; it sports hand-wrapped wirewound resistors in the range
> >> switching circuitry. Still nicely calibrated, too, according to my
> >> digital meter.
> >>
> >> I found the meter, in pieces, in a trashcan at RCA Broadcast in the
late
> >> '60's when I was working there-- somebody had dropped it on the
concrete
> >> floor. I took it home and repaired the case and other cracks with
epoxy.
> >>
> >> Isaac
> >
> > Where were you when I bought 40 BC-100 modules!
> >
> > Well I have a General Radio Type 1432J Decade Resistor at arms length.
> > Also a Tektronix 570 tube tracer, Hickok 539c tube tester, Weston 733
> > tube tester....I'm sure I have something older....than me! I might add
> > this stuff rocks! They can try and peel it from my cold dead fingers.
> >
>
> We've got one of these and it's a lot older than I am:
>
> http://www.electricstuff.co.uk/3nfset.jpg
>
> By the way, this was probably the world's first successful attempt at
> building an integrated circuit, in the mid 20's. The tube has multiple
> sections in there along with caps and resistors. So other than the
> resonant circuit, the speaker and the batteries you didn't need anything
> else to build a radio:
>
> http://www.electricstuff.co.uk/3nfcct.gif
>
> --
> Regards, Joerg
>
> http://www.analogconsultants.com/
>
> "gmail" domain blocked because of excessive spam.
> Use another domain or send PM.


By how much do you have to de-rate Rs used in a vacuum ?


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/




From: Joerg on 22 Sep 2009 10:26
N_Cook wrote:
> Joerg <invalid(a)invalid.invalid> wrote in message
> news:7hqj7pF2ue5boU1(a)mid.individual.net...

[...]

>> By the way, this was probably the world's first successful attempt at
>> building an integrated circuit, in the mid 20's. The tube has multiple
>> sections in there along with caps and resistors. So other than the
>> resonant circuit, the speaker and the batteries you didn't need anything
>> else to build a radio:
>>
>> http://www.electricstuff.co.uk/3nfcct.gif
>>
>> --
>> Regards, Joerg
>>
>> http://www.analogconsultants.com/
>>
>> "gmail" domain blocked because of excessive spam.
>> Use another domain or send PM.
>
>
> By how much do you have to de-rate Rs used in a vacuum ?
>

Why do you want to derate in a vacuum?

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
From: Kai-Martin Knaak on 22 Sep 2009 10:38
On Tue, 22 Sep 2009 07:26:34 -0700, Joerg wrote:

>> By how much do you have to de-rate Rs used in a vacuum ?
>>
>>
> Why do you want to derate in a vacuum?

Vacuum lacks the cooling by rising air.

---<(kaimartin)>---
--
Kai-Martin Knaak tel: +49-511-762-2895
Universität Hannover, Inst. für Quantenoptik fax: +49-511-762-2211
Welfengarten 1, 30167 Hannover http://www.iqo.uni-hannover.de
GPG key: http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmk&op=get
From: Joerg on 22 Sep 2009 10:59
Kai-Martin Knaak wrote:
> On Tue, 22 Sep 2009 07:26:34 -0700, Joerg wrote:
>
>>> By how much do you have to de-rate Rs used in a vacuum ?
>>>
>>>
>> Why do you want to derate in a vacuum?
>
> Vacuum lacks the cooling by rising air.
>

Ah, ok, I thought he meant the resistance. Inside a tube you have to use
a resistor that is temperatur-insensitive. When I peek into the 3NF it
looks like they are encapsulated in glass.

Resistors are staunch parts. As a teenager I worked in a company that
made specialty electric gear. One of my jobs was to braze huge brake
resistor arrays for locomotives, the size of a closet. They could get
red-hot and still perform their job.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
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